Intake control system of internal combustion engine

摘要

An intake control system of an internal combustion engine comprises an intake control valve disposed in an intake passage of each cylinder of the engine and a rotary solenoid actuator that drives the intake control valve to open and to close. Fan-shaped parts of a rotor and projecting parts of a stator of the actuator form air gaps in a circumferential direction. Circumferential length of the air gaps change with rotation of the rotor. Electromagnetic coils are disposed in the stator and generate magnetic flux mainly through the air gaps that are shortened when the rotor is rotated by supplying current to the electromagnetic coils. A support shaft of the intake control valve is connected with a spring that holds the intake control valve at a neutral position when the electromagnetic coils are supplied with no current.